The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 06, 2005
Filed:
Jul. 06, 2002
Erich Junginger, Stuttgart, DE;
Dietmar Blessing, Holzgerlingen, DE;
Christian Zimmermann, Tuebingen, DE;
Wilhelm Haag, Reutlingen, DE;
Frank Molwitz, Kornwestheim, DE;
Rene Schenk, Tamm, DE;
Bernd Hilgenberg, Reutlingen, DE;
Johann Riegel, Bietigheim-Bissingen, DE;
Erich Junginger, Stuttgart, DE;
Dietmar Blessing, Holzgerlingen, DE;
Christian Zimmermann, Tuebingen, DE;
Wilhelm Haag, Reutlingen, DE;
Frank Molwitz, Kornwestheim, DE;
Rene Schenk, Tamm, DE;
Bernd Hilgenberg, Reutlingen, DE;
Johann Riegel, Bietigheim-Bissingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
For achieving a highest possible measuring accuracy of a circuit for measuring the internal resistance of an exhaust-gas sensor, a method and a circuit for measuring the internal resistance R() of an electrochemical cell () are provided for determining the temperature of an exhaust-gas sensor, especially of a motor vehicle. The circuit is provided with the objective to improve the control to a constant temperature to therefore also improve the performance of the exhaust-gas sensor. A measurement current I_Mess () is applied to the internal resistance R() of the electrochemical cell () and a resulting first voltage is detected. A switchover to a reference resistor Rtakes place from time to time or at regular time intervals. With a switchover to the reference resistor R, the resulting second voltage is stored and thereafter is applied as a reference value for the measurement of the internal resistance R(). The switchover () to the reference resistor Rtakes place, for example, via force/sense lines.